I got this iworm/Trojan once and it created a new admin account, locked the task manager, removed the run command from the start button, could not access my computer, changed my desktop to and ad for free spyware removal, changed my home page and would not let me change it back, once in google every search I did redirected to the free spyware page, could not boot into safe mode or system restore it would just restart my computer, deleted avg and adaware and would not let me install from a disk any antivirus or spyware!
to make things worse this happended two days before I moved and I could not find my restore disk, and after a week with out my computer I finally went and bought Vista, reformat and there all better! two weeks later I found the disk but glad I went with Vista!
I lost so much stuff though, now the GF has a user account and if needed a program I will install it, and regular backups...